Tire gauge



March 7g 1944.

TIRE GAUGE Filed Feb. 26. 1943 2 snees-shgar 1 Inventor Clarence ZZSZ" v Patented Mar. 7, 1944 UNITED STATIL'S Pmlarrr ori-"lola:

Clarence G. Rist, St. Paul, Minn., assigner of onehalf to Russell T. Rist, St. Paul, Minn.

Application February 26, 1943, Serial No. 477,278

(ci. 'z3-1,11)

` 3 Claims. The present invention relates to new and useful improvements in tire gauges and hasV for its object to provide a device of this character of purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had `to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a side elevational view.

Figure 2 is a vertical sectional'view taken on a line 2-2 of Figure 1. I

Figure 3 is a vertical/sectional view through the outer barrel showing the inner barrel in normal position out of contact with the valve of the tire. I

Figure 4 is a similar view showing the inner barrel depressed for actuating the plunger of the gauge.

Figure 5 is a transverse sectional view taken on a line 5-5 of Figure 2, and

Figure 6 isa fragmentary detail of the'plunger.

Referring now to the drawings in detail, the

simple and practical construction, which is neat and attractive in appearance, inexpensive to manufacture and otherwise Well adapted for the numeral 5 designates an outer barrel or casing' having one end internally threaded for attaching to a tire valve stem 6 which is provided with the usual valve 'I operable upon a depressing movement to open the valve.

The other end of the casing 5 is formed with an internal nange 8 which overlies a. shoulder 9 formed on one end of an inner barrel I0, said inner barrel having a close working t in the outer casing 5.

The end of the inner barrel adjacent the shoulder 9 is dome-shaped `as shown at II and projects outwardly beyond the adjacent end of the outer casing.

The other end of the inner barrel bears against a soft rubber ring I2 seated on the end of the valve stem and a perforated disk I3 is fixedly secured in the inner barrel at its end adjacent said ring and is formed with a lug I4 adapted to engage the valve l when the dome Il is depressed. The ring I2 is suiciently elastic to L the latter, one end of the lrod being reduced and inserted through the plunger and the other end of the rod bearing against the dome.

The outer casing 5 and inner barrel I0 are formed of transparent plastic material and the inner barrel I0 on its outer surface is formed with a scale I8 indicating air pressure in pounds.

In the operation of the gauge, the dome Il is depressed suicientlyto open the valve l and thus admit air from the tire into the inner barrel I0 against the bottom of the plunger I5. The pressure of air acting on the plunger will raise the latter in the inner barrel against the pressure of the spring I6 to register the air pressure on the scale. The spring I6 will return the plunger to its normal position upon release of the dome I I.

It is believed the details of construction, advantages and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

Having described the invention what I claim as new is':

1. A tire gauge comprising an outer barrel adapted for attaching to a tire valve stem, an inner barrel having a sliding rlt in the outer barrel, one end of the inner barrel being closed and projecting from one end of the outer barrel for depressing the inner barrel, a valve actuating member carriedv by the inner barrel for opening 'the tire valve upon a depressing movement of the inner barrel, said inner barrel having communication with the valve stem, one of said barrels having a pressure indicating scale thereon, and a spring biased plunger mounted in the inner barrel in cooperating relation with the scale and responsive to air pressure entering the latter for actuating the plunger, said barrels being transparent to view the position of the plunger relative to the scale.

2. A tire gauge comprising a pair of transparent barrels one working within the other, the outermost barrel being adapted for attaching to a tire valve stem and the innermost barrel having means adapted for engaging the valve of a tire to open the valve upon a depressing movement of said inner barrel, said inner barrel bcing closed at one end and having communication with the valve stem at its other end to admit air from the stem into the inner barrel, one of said barrels having a scale thereon and spring biased air pressure responsive means in the inner barrel and cooperating with the scale to indicate pressure of air therein.

3. A tire gauge comprising a pair of transparand the other end of the inner barrel having l@ communication with the valve stem, e, sheulder on the inner barrel n@ te closef @m2, en intumed. nanas on the free end of the Guter bene?. overlying; the chowder te mit outward nommen?,

- of the innen barrel, one of seid herself; having c.

scale thereon and spring hissed 'agir pressure responsive means in the inner barrel and caspereting with the scale to indicate presence of nir therein. 

